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At STP how many grams of Mg are required to produce 245 mL of H 2...

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Chemistry

At STP how many grams of Mg are required to produce 245 mL of H2 in the reaction shown below?

Mg(s) + 2 HCl(aq) → H2(g)+ MgCl2(aq)

29 g

0.266 g

0.245 g

245 g

I would appreciate any help with this,

thanks :)

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